The tricky azimuthal dependence of jet quenching at RHIC and LHC via CUJET2.0

الأصل · EN

High transverse momentum neutral pion and charged hadron suppression pattern with respect to reaction plane at RHIC and LHC energies in central and semi-peripheral AA collisions are studied in a perturbative QCD based model, CUJET2.0. CUJET2.0 has dynamical DGLV radiation kernel and Thoma-Gyulassy elastic energy loss, with both being generalized to including multi-scale running strong coupling as well as energy loss probability fluctuations, and the full jet path integration is performed in a low pₜ flow data constrained medium which has 2+1D viscous hydrodynamical expanding profile. We find that in CUJET2.0, with only one control parameter, αmax, the maximum coupling strength, fixed to be 0.26, the computed nuclear modification factor RAA in central and semi-peripheral AA collisions are consistent with RHIC and LHC data at average χ²/d.o.f.<1.5 level. Simultaneous agreements with high pₜ azimuthal anisotropy v₂ data are acquired given average αmax over in-plane and out-of-plane paths varying as little as 10%, suggesting a non-trivial dependence of the high pₜ single particle v₂ on the azimuthally varied strong coupling.